Bosch Rexroth | H-4WEH25E6X6EW110N9ETDALB10D3
H-4WEH25E6X/6EW110N9ETDAL/B10D3
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The H-4WEH25E6X/6EW110N9ETDAL/B10D3 is produced by Bosch Rexroth for the WEH Directional Spool Valves series and directs pressurized flow in automated hydraulic manifolds. It relies on electro-hydraulic actuation, so a pilot stage moves the main spool without direct mechanical force, supporting remote control in complex machines. The valve provides four ways, and the L spool symbol establishes the specific crossover pattern used during shifting. A nominal size of NG25 aligns the port pattern with high-flow subplates common to industrial power units. A 6E high-power pilot valve delivers the pilot energy needed for rapid response under load. Pilot oil is supplied internally through the ET channel, eliminating external hoses, while pilot oil returns internally to the T port to simplify plumbing. For the three-position spring-centered version, 14.2 cm³ of pilot volume must be displaced during every shift, which sets the demand on the pilot circuit’s pump and accumulator.
The main flow paths at ports P, A, and B withstand operating pressures up to 350 bar, so the valve can be installed in high-pressure presses or injection systems; the T port is limited to 250 bar, protecting the tank line from excessive backpressure. A secondary pressure of 45 bar at point d3 maintains reliable pilot performance after rapid cycling. A 1.0 mm throttle insert meters pilot flow and dampens pressure spikes created during spool movement. Hydraulic fluid must reach ISO 4406 cleanliness class 20/18/15 to prevent spool sticking and wear. A concealed N9 manual override lets maintenance staff shift the spool when power is absent without disturbing panel wiring. Six M12 × 60 mounting screws fasten the body to its subplate, ensuring alignment of sealing lands. An MTTFd of 100 years supports functional-safety calculations for long-life machinery.
Technical Specifications
Actuation Type
Electro-Hydraulic
Cleanliness Class
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Operating Pressure (p, A, B)
350 bar
Max Pressure (port T)
250 bar
Mounting Screws
6 x M12 x 60
Mttfd Value
100 Years
Nominal Size
NG25 (W.H 25)
Pilot Oil Return
Internal (T)
Pilot Oil Supply
Internal (ET)
Pilot Valve Type
6E High-Power
Pilot Volume (3-pos Spring-centered)
14.2 cm3
Secondary Pressure (d3)
45 bar
Spool Symbol
L
Throttle Insert Diameter
1.0 mm
Ways
4
1620 Old Apex Road
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